Is SWOS really so bad? I have 11 pcs RB260GS, firmware cannot be updated on 4 pcs. Why? Is it faulty HW, 4 pcs at once? Why can't I update the last 4 I bought and can I update the old ones? They are all CSS106-5G-1Sr2 - do they really have identical HW? I always upgraded immediately after purchase, ...